Extended Data Fig. 1: Gold dynamic strength and hardness.
From: Metals strengthen with increasing temperature at extreme strain rates
a, The impact velocity versus CoR is plotted on a double-logarithmic scale for alumina impacts on gold substrates at 20 °C (blue) and 97 °C (red). Using scaling for ideally plastic impacts, the dynamic yield strength for each impact temperature is calculated to be Yd,20°C = 297 MPa and Yd,97°C = 311 MPa. Uncertainty in measured velocities is ±2%, which is on the order of the size of the data markers. b, The dynamic hardness of titanium is plotted for both 20 °C (blue) and 97 °C (red). For impact at similar strain rates, the tests at 97 °C show a higher hardness, and measurement uncertainties are on the order of the size of the data markers.